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4x-39=-3(x-1)
We move all terms to the left:
4x-39-(-3(x-1))=0
We calculate terms in parentheses: -(-3(x-1)), so:We get rid of parentheses
-3(x-1)
We multiply parentheses
-3x+3
Back to the equation:
-(-3x+3)
4x+3x-3-39=0
We add all the numbers together, and all the variables
7x-42=0
We move all terms containing x to the left, all other terms to the right
7x=42
x=42/7
x=6
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